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An Evanston & North Shore Family Law Firm


Ready-For-Anything, Tough-As-Nails Lawyers Who Care About Your Goals

I Need A Lawyer Today

Elite Representation for Chicagoland Families

An American Divorce Occurs Every 42 Seconds.

O. Long Law, LLC makes sure you’re prepared, and heard, if it happens to you. From providing for your children to negotiating with your ex, our family lawyers will have the awkward conversations, dive into messy financials, and try to resolve things amicably. But when it’s appropriate or essential – we’ll fight hard, so you walk away, ready to start a new life.

As well-respected litigators and leaders in the field of family law, the talent pool at O. Long Law is deep, and our experience is extensive. Our insight regarding high-asset dissolutions, dividing businesses, forensic accounting, and asset valuation and allocation make us ideal for addressing or anticipating whatever gets thrown at you.


We’re Tireless Family Advocates for


Contested, Uncontested, or Default. We’ll get you past it.

Child Custody

Shared, Joint, or Sole – your kids will be ok.

Child Support

Fair agreements and financial stability for your children.

Spousal Support

Also known as “alimony,” we go after everything you’re entitled to.

Protection Orders

Don’t put up with threats, abuse, or violence a second longer.

LGBTQ Family Law

Full-spectrum service for civil unions, second-parent adoptions, and surrogacy.


Protect your assets and plan for the future with prenuptial agreements.

Commercial Litigation

For the broad disputes businesses, individuals, and families encounter.


Let us explain your options honestly and tenaciously serve your interests.

O. Long Law strives to find solutions that save our clients time, money, and stress. The fact is, fighting it out in court costs more of each. Working something out is easier and cheaper. So agree when you can, fight when you must, but always fight to win.

You Want It Over. We Make It Happen.

Women-led family lawyers, empowered to see you through it.

We saw the need for progressive, highly efficient, and highly-effective representation for those experiencing a family law crisis. It's what makes O. Long Law unique and how we get clients beyond family law issues to a stable future.

Meet Your Team

Olivia St. Clair Long headshot

St. Clair

Founder, Principal Attorney

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Allison Brunell Sise

Senior Attorney

Distinguished By Experience & Success

Our skill, knowledge, and no-bull attitude make O. Long Law attorneys

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O. Long Law Client Testimonials

Our past clients say it best.

Frequently Asked Questions

What Family Law Cases Do You Handle?

We primarily represent family law clients in matters including divorce, child custody (now known as parenting time), child support, and spousal support (formerly known as alimony). We are particularly proud of our skill in complex divorces involving business interests or significant assets.

In What North Shore Areas Do You Practice?

We practice in Cook, Lake, Will, Kane, and DuPage counties. This includes the suburban Chicago communities of Evanston, Northbrook, Deerfield, Glenview, Northfield, Glencoe, Highland Park, Kenilworth, Lake Bluff, Lake Forest, Wilmette, and Winnetka.

How Fast Can I Get Divorced?

If you meet the residency criteria, Illinois doesn’t have a waiting period for uncontested divorces. But, the time it takes to finalize a divorce varies based on factors such as: whether or not you have children, how many assets are involved, and the level of agreement on critical issues.

We always work to achieve the most time- and cost-efficient solution.

I Don’t Work Outside the Home. How Can I Afford an Attorney?

Illinois law has a method to “level the playing field” for spouses who do not have access to marital assets that could pay for an attorney. We can assist you in determining whether you can benefit.